diff --git a/README.md b/README.md
index 7b790d7e..42230793 100644
--- a/README.md
+++ b/README.md
@@ -43,3 +43,4 @@ _acme4j_ is open source software. The source code is distributed under the terms
 * Thanks to [Daniel McCarney](https://github.com/cpu) for his help with the ACME protocol, Pebble, and Boulder.
 * [Ulrich Krause](https://github.com/eknori) for his help to make _acme4j_ run on IBM Java VMs.
 * I also like to thank [everyone who contributed to _acme4j_](https://github.com/shred/acme4j/graphs/contributors).
+* [JetBrains](https://www.jetbrains.com/?from=acme4j) kindly provided a free open source license for IntelliJ IDEA.